:root{
  --bg:#0d1106;--deep:#080a03;--ink:#eff3e7;--mut:#b5bea5;--acc:#ade35f;--acc2:#c8f08f;--on:#0e1404;
  --bar:rgba(208,240,150,.22);--bar2:rgba(208,240,150,.38);--pane:rgba(217,255,160,.05);--pane2:rgba(217,255,160,.085);
  --lamp:#ffa0de;--err:#f6a6ff;
  --serif:"Brygada 1918",Georgia,"Times New Roman",serif;--sans:"Golos Text",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Sometype Mono",ui-monospace,Consolas,"Courier New",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background-color:#0d1106;color:var(--ink);font:400 17px/1.65 var(--sans);overflow-x:hidden;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:
  radial-gradient(46vw 40vh at 8% 4%,rgba(117,170,44,.26),transparent 70%),
  radial-gradient(30vw 34vh at 94% 26%,rgba(255,130,211,.085),transparent 70%),
  radial-gradient(38vw 30vh at 4% 62%,rgba(65,130,30,.16),transparent 72%),
  radial-gradient(60vw 46vh at 80% 100%,rgba(98,140,36,.2),transparent 70%)}
img,svg{max-width:100%}
a{color:var(--acc2);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:#ffffff}
:focus-visible{outline:2px solid var(--lamp);outline-offset:3px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.14;margin:0;letter-spacing:-.01em;overflow-wrap:break-word}
p{margin:0 0 1em}
code,pre,kbd{font-family:var(--mono)}
.skip{position:absolute;left:12px;top:-80px;z-index:100;background:var(--acc);color:var(--on);padding:12px 16px;font-weight:600}
.skip:focus{top:12px}

/* ---------- transom header ---------- */
.top{position:sticky;top:0;z-index:50;background:rgba(11,15,5,.72);-webkit-backdrop-filter:blur(18px) saturate(1.3);backdrop-filter:blur(18px) saturate(1.3);border-bottom:1px solid var(--bar2);box-shadow:0 1px 0 rgba(0,0,0,.5),0 18px 40px -24px rgba(0,0,0,.8)}
.top-in{max-width:1120px;margin:0 auto;display:flex;align-items:stretch;min-height:62px;padding:0 20px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:600 20px/1 var(--serif);padding-right:22px;min-height:44px;white-space:nowrap}
.logo i{font-style:normal;color:var(--acc)}
.mark{width:28px;height:28px;flex:none}
.nav{display:flex;align-items:stretch;margin-left:auto}
.nav a{display:flex;align-items:center;padding:0 18px;border-left:1px solid var(--bar);color:var(--mut);text-decoration:none;font-size:15px;font-weight:500;position:relative}
.nav a:last-child{border-right:1px solid var(--bar)}
.nav a:hover{color:var(--ink);background:var(--pane)}
.nav a[aria-current]{color:var(--ink);background:linear-gradient(to top,rgba(173,227,95,.2),transparent 70%)}
.nav a[aria-current]::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--acc)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border:1px solid var(--acc);background:var(--acc);color:var(--on);font:600 16px/1.2 var(--sans);text-decoration:none;cursor:pointer;border-radius:0;text-align:center;box-shadow:0 0 0 0 rgba(173,227,95,0),0 10px 30px -12px rgba(173,227,95,.55);transition:background .15s,box-shadow .15s}
.btn:hover{background:#d0f59a;color:var(--on);box-shadow:0 0 0 4px rgba(173,227,95,.16),0 10px 30px -10px rgba(173,227,95,.7)}
.btn.ghost{background:rgba(217,255,160,.04);color:var(--ink);border-color:var(--bar2);box-shadow:none}
.btn.ghost:hover{background:var(--pane2);border-color:var(--acc);color:#ffffff}
.btn.sm{min-height:44px;padding:0 16px;font-size:15px}
.cta{align-self:center;min-height:44px;margin-left:20px;white-space:nowrap}
.burger{display:none;align-self:center;width:44px;height:44px;margin-left:8px;border:1px solid var(--bar2);background:var(--pane);color:var(--ink);align-items:center;justify-content:center;cursor:pointer;border-radius:0;padding:0}

/* ---------- column + glazed bays ---------- */
main{display:block;padding:0 0 40px;counter-reset:bay}
.col{max-width:720px;margin:0 auto;padding:0 20px;min-width:0}
.bay{position:relative;background:linear-gradient(180deg,var(--pane2),var(--pane) 38%,rgba(217,255,160,.03));border:1px solid var(--bar2);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:inset 0 1px 0 rgba(255,255,255,.07),0 34px 60px -38px rgba(0,0,0,.9);overflow:hidden;min-width:0}
.bay::after{content:"";position:absolute;left:0;right:0;bottom:0;height:54px;pointer-events:none;background:linear-gradient(to top,rgba(239,255,214,.075),transparent)}
.pane{position:relative;padding:22px 22px 24px;min-width:0;box-shadow:1px 0 0 var(--bar),0 1px 0 var(--bar)}
.pane h3{font-size:20px;margin-bottom:8px}
.pane p{margin:0;color:var(--mut);font-size:16px;line-height:1.6}
.g2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
.stack .pane{display:grid;grid-template-columns:64px minmax(0,1fr);gap:4px 14px;align-items:start}
.n{font:500 34px/1 var(--serif);color:var(--acc);opacity:.9;padding-top:2px}
.uc .pane::before{content:"";display:block;width:26px;height:13px;border:1.5px solid var(--acc);border-bottom-width:1.5px;border-radius:26px 26px 0 0;margin-bottom:14px;background:rgba(173,227,95,.14)}
.sec{margin-top:72px}
.sec.plain{margin-top:28px}
.sec-h{font-size:clamp(27px,4.2vw,34px);margin-bottom:22px;display:flex;align-items:baseline;gap:14px}
.sec-h::before{counter-increment:bay;content:counter(bay,decimal-leading-zero);font:500 13px/1 var(--mono);color:var(--acc);border:1px solid var(--bar2);padding:6px 7px;flex:none;transform:translateY(-4px);background:var(--pane)}
.acts{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- facts ---------- */
.facts{margin:28px 0 0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}
.facts .pane{padding:16px 14px 18px;display:flex;flex-direction:column;gap:6px}
.facts dt{font:500 11.5px/1.35 var(--mono);color:var(--mut);text-transform:uppercase;letter-spacing:.06em;order:2}
.facts dd{margin:0;font:600 21px/1.15 var(--serif);color:var(--ink);overflow-wrap:anywhere}
.board{grid-template-columns:repeat(6,minmax(0,1fr))}
.board .pane{grid-column:span 2}
.board .pane:nth-child(-n+2){grid-column:span 3;padding:26px 22px 28px;background:linear-gradient(to top,rgba(173,227,95,.13),transparent 75%)}
.board .pane:nth-child(-n+2) dd{font-size:clamp(34px,7vw,50px);color:var(--acc2)}
.subnote{margin:16px 0 0;font:400 14px/1.5 var(--mono);color:var(--mut);padding-left:14px;border-left:2px solid var(--acc)}

/* ---------- home hero: arched window ---------- */
.hero{padding-top:44px}
.fan{display:block;width:100%;height:auto;margin-bottom:-1px;filter:drop-shadow(0 0 34px rgba(173,227,95,.2))}
.hero-in{position:relative;border:1px solid var(--bar2);border-top:0;padding:34px 34px 0;background:linear-gradient(180deg,rgba(217,255,160,.1),rgba(217,255,160,.035));-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);text-align:center;box-shadow:0 34px 60px -38px rgba(0,0,0,.9)}
.eyebrow{font:500 13px/1.4 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--acc);margin-bottom:18px}
.hero h1{font-size:clamp(34px,6.6vw,58px);letter-spacing:-.02em;text-wrap:balance}
.lead{font-size:19px;line-height:1.6;color:#d6ddc9;margin:20px 0 0}
.hero .lead{max-width:34em;margin-left:auto;margin-right:auto;text-wrap:pretty}
.hero .acts{justify-content:center;margin:28px 0 34px}
.lights{list-style:none;margin:0 -34px;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--bar2);text-align:left}
.lights li{padding:18px 18px 20px;font-size:15px;line-height:1.5;color:var(--ink);border-left:1px solid var(--bar);background:linear-gradient(to top,rgba(239,255,214,.07),transparent 60%)}
.lights li:first-child{border-left:0}
.lights li::before{content:"";display:block;width:8px;height:8px;background:var(--acc);margin-bottom:10px;box-shadow:0 0 12px var(--acc)}
.hero-code{border:1px solid var(--bar2);border-top:0;background:rgba(6,8,2,.74);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}
.try{font:500 13px/1.4 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--mut);padding:16px 20px 0}

/* ---------- code ---------- */
.codebox{min-width:0}
.codetabs{display:flex;border-bottom:1px solid var(--bar);padding:10px 20px 0;gap:0;overflow-x:auto}
.codetabs button{min-height:44px;padding:0 18px;background:none;border:1px solid transparent;border-bottom:0;color:var(--mut);font:500 14px/1 var(--mono);cursor:pointer;border-radius:0;white-space:nowrap}
.codetabs button:hover{color:var(--ink)}
.codetabs button[aria-selected="true"]{color:var(--acc2);border-color:var(--bar2);background:var(--pane2);box-shadow:inset 0 2px 0 var(--acc)}
pre.code{position:relative;margin:0;padding:8px 20px 22px;overflow-x:auto;max-width:100%;font:400 14px/1.7 var(--mono);color:#e3ebd6;background:rgba(6,8,2,.78);border:1px solid var(--bar);tab-size:2;-webkit-overflow-scrolling:touch}
.codebox pre.code{border:0;background:none}
pre.code code{display:block;width:max-content;min-width:100%;white-space:pre}
.copy{display:block;position:sticky;left:calc(100% - 92px);width:max-content;min-width:72px;min-height:44px;margin:0 0 4px auto;padding:0 14px;background:rgba(14,20,6,.9);border:1px solid var(--bar2);color:var(--ink);font:500 12.5px/1 var(--mono);cursor:pointer;border-radius:0}
.copy:hover{border-color:var(--acc);color:var(--acc2)}
.code .k{color:var(--acc)}.code .s{color:#ffa0de}.code .c{color:#9ba786;font-style:italic}

/* ---------- page head ---------- */
.pagehead{padding:34px 0 0}
.pagehead h1{font-size:clamp(32px,5.6vw,48px);letter-spacing:-.02em;text-wrap:balance}
.crumbs ol{list-style:none;margin:0 0 20px;padding:0;font:400 12.5px/1.9 var(--mono);color:var(--mut)}
.crumbs li{display:inline;overflow-wrap:anywhere}
.crumbs li+li::before{content:"/";margin:0 10px;color:var(--bar2)}
.crumbs a{color:var(--acc2);text-decoration:none;display:inline-block;padding:10px 0;margin:-10px 0}
.crumbs a:hover{text-decoration:underline}
.dateline{font:400 13px/1.4 var(--mono);color:var(--mut);margin:18px 0 0}

/* ---------- prose ---------- */
.prose{margin-top:64px;min-width:0}
.pagehead+.prose{margin-top:36px}
.prose>*{max-width:100%}
.prose h2{font-size:clamp(25px,4vw,31px);margin:56px 0 16px;padding-top:22px;border-top:1px solid var(--bar);position:relative}
.prose h2::before{content:"";position:absolute;top:-1px;left:0;width:54px;height:3px;background:var(--acc)}
.prose>h2:first-child,.prose>div:first-child>h2:first-child{margin-top:0}
.prose h3{font-size:21px;margin:32px 0 10px}
.prose p,.prose li{color:#dee4d3}
.prose ul,.prose ol{padding-left:22px;margin:0 0 1.1em}
.prose li{margin-bottom:.45em}
.prose li::marker{color:var(--acc)}
.prose strong{color:#ffffff;font-weight:600}
.prose :not(pre)>code,.keyout code{font-size:.86em;background:rgba(217,255,160,.09);border:1px solid var(--bar);padding:1px 6px;color:var(--acc2);overflow-wrap:anywhere}
.prose pre.code{margin:22px 0 26px;box-shadow:0 30px 50px -36px rgba(0,0,0,.9)}
.prose table{width:100%;border-collapse:collapse;font-size:15px;background:var(--pane);min-width:460px}
.prose div:has(>table),.k21ccs{overflow-x:auto;max-width:100%;margin:22px 0 28px;border:1px solid var(--bar2);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.prose th,.prose td{padding:12px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--bar);border-right:1px solid var(--bar);line-height:1.5}
.prose tr>:last-child{border-right:0}.prose tbody tr:last-child>*{border-bottom:0}
.prose thead th{font:500 12px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.07em;color:var(--acc);background:rgba(173,227,95,.09)}
.prose tbody th{font-weight:600;color:var(--ink)}
.prose td{color:#dee4d3}
.prose blockquote{margin:22px 0;padding:14px 18px;border-left:2px solid var(--acc);background:var(--pane)}
.long{font-size:18px;line-height:1.75}
.long h2{margin-top:64px}

/* ---------- FAQ ---------- */
.faq summary{list-style:none;cursor:pointer;font:600 19px/1.35 var(--serif);padding:20px 56px 20px 22px;margin:-22px -22px -24px;min-height:44px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:22px;top:50%;width:14px;height:14px;margin-top:-7px;background:linear-gradient(var(--acc),var(--acc)) center/14px 1.5px no-repeat,linear-gradient(var(--acc),var(--acc)) center/1.5px 14px no-repeat;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq summary:hover{background:var(--pane)}
.faq details[open]{background:linear-gradient(to top,rgba(173,227,95,.08),transparent)}
.faq details p{margin:30px 0 0;padding-top:0;color:#dee4d3}

/* ---------- closing ---------- */
.closing{margin-top:84px}
.closing .fan{width:56%;margin-left:auto;margin-right:auto}
.closing-in{padding:34px 28px 40px;text-align:center}
.closing-in h2{font-size:clamp(27px,4.6vw,36px)}
.closing-in p{color:var(--mut);margin:12px auto 24px;max-width:30em}
.closing-in .acts{justify-content:center}

/* ---------- key page ---------- */
.p-key .pagehead{padding-top:26px}
.p-key .pagehead h1{font-size:clamp(30px,4.8vw,42px)}
.p-key .lead{font-size:17.5px;margin-top:14px}
.keybay{margin-top:26px;position:relative;border:1px solid var(--acc);background:linear-gradient(180deg,rgba(173,227,95,.14),rgba(217,255,160,.05) 30%,rgba(8,12,3,.5));-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);box-shadow:0 0 0 6px rgba(173,227,95,.07),0 0 70px -10px rgba(173,227,95,.3),0 40px 70px -40px #000000}
.keybay-h{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 16px;padding:18px 24px;border-bottom:1px solid var(--bar2)}
.keybay-h h2{font-size:23px}
.keybay-h p{margin:0;color:var(--mut);font-size:15px}
.form{padding:22px 24px 26px;min-width:0}
.tabs2{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--bar2);margin-bottom:18px}
.tabs2 button{min-height:46px;background:rgba(6,8,2,.5);border:0;color:var(--mut);font:500 15px/1.2 var(--sans);cursor:pointer;border-radius:0;padding:0 10px}
.tabs2 button+button{border-left:1px solid var(--bar2)}
.tabs2 button[aria-selected="true"]{background:var(--pane2);color:var(--ink);box-shadow:inset 0 -2px 0 var(--acc)}
.msg{font-size:15px;line-height:1.5}
.msg:empty{display:none}
.msg:not(:empty){padding:12px 14px;margin-bottom:16px;border:1px solid var(--bar2);background:var(--pane2);color:var(--ink)}
.msg.err:not(:empty){border-color:rgba(244,130,255,.6);background:rgba(234,90,255,.12);color:var(--err)}
.row{margin-bottom:16px;min-width:0}
.row label,.calc label{display:block;font:500 12.5px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.07em;color:var(--mut);margin-bottom:7px}
input,select,textarea{font:400 16px/1.4 var(--sans);color:var(--ink);background:rgba(7,9,2,.66);border:1px solid var(--bar2);border-radius:0;min-height:48px;padding:10px 14px !important;width:100%;max-width:100%;-webkit-appearance:none;appearance:none}
select{background-image:linear-gradient(45deg,transparent 50%,var(--acc) 50%),linear-gradient(135deg,var(--acc) 50%,transparent 50%);background-position:calc(100% - 20px) 50%,calc(100% - 14px) 50%;background-size:6px 6px;background-repeat:no-repeat;padding-right:38px !important}
select option{background:#0d1106;color:var(--ink)}
textarea{min-height:150px;resize:vertical;line-height:1.55}
input:focus,select:focus,textarea:focus{outline:2px solid var(--acc);outline-offset:1px;border-color:var(--acc);background:rgba(7,9,2,.85)}
input::placeholder,textarea::placeholder{color:#a0a98f}
.note{font-size:13.5px;line-height:1.5;color:var(--mut);margin:8px 0 0}
.form form .btn,.formbay form .btn{width:100%;margin-top:4px}
.form [data-gauth]{min-height:48px}
.keyout{display:none}
.keyout.on{display:block;border-top:1px solid var(--bar2);margin-top:22px;padding-top:22px}
.keyout h3{font-size:22px;margin-bottom:12px}
.keybox{display:flex;align-items:stretch;border:1px solid var(--acc);background:rgba(7,9,2,.8)}
.keybox span{flex:1;min-width:0;padding:12px 14px;font:500 14px/1.5 var(--mono);color:var(--acc2);overflow-wrap:anywhere;word-break:break-all}
.keybox .btn{flex:none;border-width:0 0 0 1px}
.keyout p{font-size:15px;line-height:1.9;margin:12px 0}
.keyout strong{color:var(--mut);font-weight:500}
.keyout .acts{gap:10px;margin-top:16px}
.mut{color:var(--mut)}
.formbay{margin-top:30px;padding:10px 24px 28px}
.formbay [data-support-msg]{color:var(--acc2);font-size:15px}

/* ---------- calculator ---------- */
.calc{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
.calc>div{padding:22px 22px 24px;box-shadow:1px 0 0 var(--bar),0 1px 0 var(--bar);min-width:0}
.calc>div:last-child{grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 20px;background:linear-gradient(to top,rgba(173,227,95,.16),rgba(173,227,95,.03))}
.calc>div:last-child label{margin:0}
.calc output{font:600 clamp(36px,8vw,52px)/1 var(--serif);color:var(--acc2);overflow-wrap:anywhere}
.calc input{font-family:var(--mono);font-size:17px}
.ex .pane p{font-family:var(--mono);font-size:14px;line-height:1.65;overflow-wrap:anywhere}

/* ---------- toc ---------- */
.toc{border:1px solid var(--bar2);background:var(--pane);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);padding:18px 20px 12px;margin:32px auto 0;max-width:680px}
.toc-h{font:500 12px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--acc);margin:0 0 8px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t;border-top:1px solid var(--bar)}
.toc a{display:grid;grid-template-columns:30px minmax(0,1fr);align-items:baseline;min-height:44px;padding:11px 0;color:var(--ink);text-decoration:none;font-size:15px;line-height:1.4}
.toc a::before{content:counter(t,decimal-leading-zero);font:400 12px/1 var(--mono);color:var(--mut)}
.toc a:hover{color:var(--acc2)}
.toc-index ol{columns:2;column-gap:28px}
.toc-index li{break-inside:avoid}
.doc{padding:0}
.doc>.toc{margin-left:20px;margin-right:20px}
.takeaways{margin-top:30px;padding:24px 26px 26px}
.takeaways h2{font:500 12px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--acc);margin-bottom:6px}
.takeaways ol{list-style:none;margin:0;padding:0;counter-reset:k}
.takeaways li{counter-increment:k;display:grid;grid-template-columns:44px minmax(0,1fr);padding:14px 0;border-top:1px solid var(--bar);font-size:17px;line-height:1.55}
.takeaways li:first-child{border-top:0}
.takeaways li::before{content:counter(k);font:500 28px/1 var(--serif);color:var(--acc)}

/* ---------- 404 ---------- */
.nf{padding-top:56px}
.nf-in{padding:34px 28px 40px;text-align:center;border-top:0}
.nf-in h1{font-size:clamp(34px,6vw,52px)}
.nf-links{list-style:none;padding:0;margin:26px 0;display:flex;flex-wrap:wrap;justify-content:center;gap:0}
.nf-links a{display:flex;align-items:center;min-height:44px;padding:0 16px;border:1px solid var(--bar);margin:-1px 0 0 -1px;text-decoration:none;color:var(--ink)}
.nf-in .acts{justify-content:center}

/* ---------- footer ---------- */
.foot{margin-top:80px;border-top:1px solid var(--bar2);background:rgba(8,10,3,.7);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.foot-in{max-width:720px;margin:0 auto;padding:36px 20px 44px}
.foot .logo{display:inline-flex;padding:0}
.foot-tag{color:var(--mut);margin:8px 0 22px;font-size:15px}
.foot-links{list-style:none;margin:0 0 24px;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--bar);border-left:1px solid var(--bar)}
.foot-links li{border-right:1px solid var(--bar);border-bottom:1px solid var(--bar);min-width:0}
.foot-links a{display:flex;align-items:center;min-height:46px;padding:8px 14px;color:var(--ink);text-decoration:none;font-size:15px;overflow-wrap:anywhere}
.foot-links a:hover{background:var(--pane2);color:var(--acc2)}
.legal{font:400 12.5px/1.6 var(--mono);color:var(--mut);margin:0}

/* ---------- wide: docs TOC in the outer margin ---------- */
@media (min-width:1240px){
  .doc{display:grid;grid-template-columns:minmax(0,1fr) 720px minmax(0,1fr);align-items:start}
  .doc>.toc{grid-column:1;justify-self:end;width:236px;margin:40px 28px 0 20px;position:sticky;top:92px;max-height:calc(100vh - 120px);overflow:auto;padding:16px 16px 8px}
  .doc>.col{grid-column:2;width:720px}
  .doc .toc a{font-size:14px;grid-template-columns:26px minmax(0,1fr);padding:9px 0}
}

/* ---------- mobile ---------- */
@media (max-width:900px){
  .top-in{padding:0 14px;flex-wrap:wrap}
  .logo{padding-right:8px;font-size:18px;margin-right:auto}
  .cta{margin-left:8px;padding:0 14px;font-size:14.5px}
  .burger{display:inline-flex}
  .nav{display:none;order:9;flex:0 0 calc(100% + 28px);margin:0 -14px;flex-direction:column;border-top:1px solid var(--bar2)}
  .nav.open{display:flex}
  .nav a{min-height:50px;border-left:0;border-bottom:1px solid var(--bar);padding:0 18px;font-size:16px}
  .nav a:last-child{border-right:0;border-bottom:0}
  .nav a[aria-current]::after{left:0;right:auto;top:0;bottom:0;width:3px;height:auto}
}
@media (max-width:640px){
  body{font-size:16.5px}
  .col{padding:0 16px}
  .hero{padding-top:28px}
  .hero-in{padding:24px 18px 0}
  .lights{margin:0 -18px;grid-template-columns:1fr}
  .lights li{border-left:0;border-top:1px solid var(--bar);display:grid;grid-template-columns:20px minmax(0,1fr);align-items:baseline;padding:14px 18px}
  .lights li:first-child{border-top:0}
  .lights li::before{margin:0}
  .hero .acts .btn,.closing-in .acts .btn{flex:1 1 100%}
  .lead{font-size:17.5px}
  .g2{grid-template-columns:1fr}
  .facts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .facts .pane:last-child{grid-column:1/-1}
  .board .pane,.board .pane:nth-child(-n+2){grid-column:auto}
  .board .pane:nth-child(-n+2){padding:20px 16px 22px}
  .board .pane:last-child{grid-column:1/-1}
  .sec{margin-top:56px}
  .stack .pane{grid-template-columns:46px minmax(0,1fr)}
  .n{font-size:28px}
  .pane{padding:18px 18px 20px}
  .faq summary{margin:-18px -18px -20px;padding:18px 50px 18px 18px;font-size:18px}
  .faq summary::after{right:18px}
  .faq details p{margin-top:26px}
  .form{padding:18px 16px 22px}
  .keybay-h{padding:14px 16px}
  .formbay{padding:6px 16px 22px}
  .calc{grid-template-columns:1fr}
  .toc-index ol{columns:1}
  .codetabs{padding:8px 12px 0}
  pre.code{padding:8px 14px 18px;font-size:13px}
  .try{padding:14px 14px 0}
  .closing .fan{width:78%}
  .long{font-size:17px}
  .pagehead{padding-top:24px}
  .p-key .pagehead{padding-top:18px}
  .p-key .crumbs ol{margin-bottom:12px}
  .keybay{margin-top:20px}
  .keybox{flex-direction:column}
  .keybox .btn{border-width:1px 0 0}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none !important;animation:none !important}
}
.foot-links li:last-child:nth-child(odd){grid-column:1/-1}
body{min-height:100vh;display:flex;flex-direction:column}
main{flex:1 0 auto;width:100%}